Index Catalog // ScholarsArchive@OSU

A microarchitecture study of the counterflow pipeline principle

Creator:: Janik, Kenneth J.
Abstract:: The counterflow pipeline concept was originated by Sproull et. al.[1] to demonstrate the concept of asynchronous circuits. The basic premise is that a simple architecture with only local communication and control and a simple regular structure will result in increased performance. This thesis attempts to analyze the performance of the...
Resource Type:: Dissertation

A P-well GaAs MESFET technology

Creator:: Canfield, Philip C.
Abstract:: The semiconductor gallium arsenide (GaAs) has many potential advantages over the more widely used semiconductor silicon (Si). These include higher low field mobility, semi-insulating substrates, a direct band-gap, and greater radiation hardness. All these advantages offer distinct opportunities for implementation of new circuit functions or extension of the operating conditions...
Resource Type:: Dissertation

A performance study of multithreading

Creator:: Kwak, Hantak
Abstract:: As the performance gap between processor and memory grows, memory latency will be a major bottleneck in achieving high processor utilization. Multithreading has emerged as one of the most promising and exciting techniques used to tolerate memory latency by exploiting thread-level parallelism. The question however remains as to how effective...
Resource Type:: Dissertation

Adaptive model-based motion estimation

Creator:: Crinon, Regis
Abstract:: A general discrete-time, adaptive, multidimensional framework is introduced for estimating the motion of one or several object features from their successive non-linear projections on an image plane. The motion model consists of a set of linear difference equations with parameters estimated recursively from a non-linear observation equation. The model dimensionality...
Resource Type:: Dissertation

Analysis and applications of layered multiconductor coupled slot and strip-slot structures

Creator:: Luo, Sifen
Abstract:: Layered multiconductor coupled slot and strip-slot structures are characterized by introducing the full-wave modal analysis as well as the quasi-TEM spectral domain technique. In the modal analysis, the electric and magnetic fields are constructed in terms of modal fields in different regions. Application of the boundary conditions at interfaces for...
Resource Type:: Dissertation

Analysis and modeling of discontinuities and inter-element coupling in passive microwave integrated circuit components

Creator:: Thorburn, Michael Arthur
Abstract:: Accurate, efficient and general computational techniques are developed to evaluate the scattering parameters of passive microstrip components composed of discontinuities in microstrip transmission lines on general two layer substrates with single and two level metallization. An open domain model is used. The Electric Field Integral Equation is examined and the...
Resource Type:: Dissertation

Analysis and modeling of GaAs MESFET's for linear integrated circuit design

Creator:: Lee, Mankoo
Abstract:: A complete Gallium Arsenide Metal Semiconconductor Field Effect Transistor (GaAs MESFET) model including deep-level trap effects has been developed, which is far more accurate than previous equivalent circuit models, for high-speed applications in linear integrated circuit design. A new self-backgating GaAs MESFET model, which can simulate low frequency anomalies, is...
Resource Type:: Dissertation

Analysis of brushless doubly-fed, stand-alone generator systems

Creator:: Gorti, Bhanuprasad V.
Abstract:: This thesis introduces a Brushless Doubly-Fed Machine (BDFM), stand-alone generator system. Development of a BDFM current-forced model, along with the analysis of air gap power distribution between the two stator windings and the rotor circuit, pave the way for the characterization and analysis of stand-alone generator systems. The main disadvantage...
Resource Type:: Dissertation

Analysis of linear and nonlinear coupled dielectric waveguides

Creator:: Chang, Hosung
Abstract:: Multiport network functions, such as impedance matrix parameters and scattering parameters, of general multiple coupled slab waveguides are derived in terms of the normal mode parameters of the system. These characteristic normal mode parameters include the propagation constants, the modal impedances, and the eigenvector matrices. It is shown that the...
Resource Type:: Dissertation

Analysis of subsynchronous resonance in power systems

Creator:: Zhu, Wenchun
Abstract:: Three aspects of Subsynchronous Resonance (SSR) related problems in power systems are addressed in this dissertation which aims at contributing to a better understanding of these problems. Subsynchronous Resonance (SSR) problems in series compensated steam-turbine power systems co-exist with the beneficial effects provided by the series capacitors. Since the early...
Resource Type:: Dissertation

Characterization and electrical circuit modeling of interconnections and packages using time domain network analysis

Creator:: Hayden, Leonard
Abstract:: The improved accuracy of Time Domain Reflection and Transmission (TDR/T) measurements made possible by the calibration process known as Time Domain Network Analysis (TDNA) is applied to the problem of characterization and modeling of electronic interconnect and packaging structures. TDNA uses measurements of known and partially known calibration standards to...
Resource Type:: Dissertation

Characterization and reduction of local oscillator phase noise effects in communications systems

Creator:: Godshalk, Edward M.
Abstract:: Recent developments in digital communications at microwave frequencies have revealed that local oscillator phase noise is often a factor in the bit error rate (BER) analysis. Digital signals transported across microwave radio links acquire waveform jitter from local oscillator phase noise. As jitter increases so does BER. The main goals...
Resource Type:: Dissertation

Characterization of coupled microstrip structure using FDTD

Creator:: Kim, Yoonsuk
Abstract:: A new CAD-oriented methodology for the full-wave broadband characterization of coupled microstrip structures for RF/microwave and high-speed digital circuits is presented. The characterization methodology is based on the finite difference time domain (FDTD) technique combined with a systematic extraction procedure using the normal mode approach and multiport network concepts. The...
Resource Type:: Dissertation

Characterization of oxygen and carbon effects in silicon material and MOSFET devices

Creator:: Haddad, Homayoon
Resource Type:: Dissertation

Cluster partitioning approaches to parallel Monte Carlo simulation on multiprocessors

Creator:: Ranawake, Udaya A.
Abstract:: We consider the parallelization of Monte Carlo algorithms for analyzing numerical models of charge transport used in semiconductor device physics. Parallel algorithms for the standard k-space Monte Carlo simulation of a three band model of bulk GaAs on hypercube multicomputers are first presented. This Monte Carlo model includes scattering due...
Resource Type:: Dissertation

CMOS low noise amplifier design utilizing monolithic transformers

Creator:: Zhou, Jianjun J.
Abstract:: Full integration of CMOS low noise amplifiers (LNA) presents a challenge for low cost CMOS receiver systems. A critical problem faced in the design of an RF CMOS LNA is the inaccurate high-frequency noise model of the MOSFET implemented in circuit simulators such as SPICE. Silicon-based monolithic inductors are another...
Resource Type:: Dissertation

Compensation techniques for cascaded delta-sigma A/D converters and high-performance switched-capacitor circuits

Creator:: Sun, Tao
Abstract:: This thesis describes compensation techniques for cascaded delta-sigma A/D converters (ADCs) and high-performance switched-capacitor (SC) circuits. Various correlated-double-sampling (CDS) techniques are presented to reduce the effects of the nonidealities, such as clock feedthrough, charge injection, opamp input-referred noise and offset, and finite opamp gain, in SC circuits. A CDS technique...
Resource Type:: Dissertation

Current mode analog and digital circuit design

Creator:: Liang, Guojin
Abstract:: In this dissertation, two important current mode circuit design subjects have been explored. In the first part, the switched-current circuit technique has been investigated. The fundamental performance and limitations of this technique are explored. One of the major limitations, the signal distortion caused by clock feedthrough has been substantially reduced...
Resource Type:: Dissertation

Data-structure builder for VLSI/CAD software

Creator:: Eum, Doo-hun
Abstract:: Relational database systems have successfully solved many business data processing problems. The primary reason of this success is that the relational data model provides a simple, yet flexible view of data as tables. In studying VLSI/CAD data, we noticed that they are often represented in formats similar to relational tuples....
Resource Type:: Dissertation

Delta-sigma modulators employing continuous-time circuits and mismatch-shaped DACs

Creator:: Zhang, Bo
Abstract:: Delta-sigma modulators are currently a very popular technique for making high-resolution analog-to-digital and digital-to-analog converters. These oversampled data converters have several advantages over conventional Nyquist-rate converters, including an insensitivity to many analog component imperfections, a simpler antialiasing filter and reduced accuracy requirements in the sample and hold. Though the initial...
Resource Type:: Dissertation

Design and computer-aided optimization of RF CMOS power amplifiers

Creator:: Gupta, Ravi
Abstract:: In recent years, there has been an extensive effort to develop low-cost implementations of radio frequency integrated circuits for consumer applications. This thesis is a research effort in the design and implementation of integrated RF CMOS Power Amplifiers (PAs). A significant challenge in the implementation of RF CMOS ICs is...
Resource Type:: Dissertation

Design of a solar powered high-pressure steam generator

Creator:: Cordy, Clifford B., 1938-
Abstract:: The design of a point focus, distributed receiver solar power system is presented. It is shown that a two axis concentrator, with a two axis solar tracker and drive, has significant advantages over other possible optical systems. It is further shown that each concentrator should have its own optical receiver...
Resource Type:: Dissertation

Design of CMOS switched-current filters

Creator:: Fiez, Theresa S.
Abstract:: The design and implementation of Switched-Current (SI) ladder filters is described. SI filters require only a standard digital CMOS process and the power supply voltage requirement is low. SI circuits also can be potentially operated at higher frequencies than Switched-Capacitor (SC) filters due to the low-impedance wideband nodes of the...
Resource Type:: Dissertation

Design techniques of high-performance switched capacitor circuits in the presence of component imperfections

Creator:: Huang, Yunteng
Abstract:: This thesis describes design techniques for high-performance switched-capacitor (SC) circuits, primarily for high-linearity low-noise SC circuits in the presence of component imperfections, such as nonlinear op-amp voltage transfer characteristics, capacitor nonlinearities as well as the finite op-amp dc gain and op-amp offset and noise. Various correlated-double-sampling (CDS) schemes are discussed,...
Resource Type:: Dissertation

Design, fabrication, and testing of inhomogeneous dielectrics

Creator:: Lim, Sungkyoo
Abstract:: In this thesis the concept of inhomogeneous dielectrics is demonstrated for various optical coating applications. Compositionally-varying silicon oxynitride (SiON) dielectric layers, with the refractive index varying as a function of position, are grown by computer-controlled plasma-enhanced chemical vapor deposition (PECVD) using silane, nitrogen, and nitrous oxide reactant gases. Compositionally graded...
Resource Type:: Dissertation

Detection and diagnosis of parameters change in linear system using time-frequency transformation

Creator:: Park, Dae-hyun
Abstract:: A systematic optimization of the Cohen class time-frequency transformation for detecting the parameters change is developed. The local moments approach to change detection is proposed and a general formula for the local moments is derived. The optimal kernel functions of the time-frequency transformation are determined based on the combined criteria...
Resource Type:: Dissertation

Dynamic control of brushless doubly-fed machines

Creator:: Zhou, Dongsheng, 1964-
Abstract:: This thesis presents the development of dynamic control strategies for the brushless doubly-fed machine (BDFM). A simple open-loop scalar controller is first investigated and its response is found to be oscillatory. Using the speed feedback signal, an improved closed loop scalar control algorithm is designed. Steady state performance is controlled...
Resource Type:: Dissertation

Dynamic modeling, simulation and stability analysis of brushless doubly-fed machines

Creator:: Li, Ruqi
Abstract:: A brushless doubly-fed machine (BDFM) is a single-frame, self-cascaded induction machine capable of operating in both the induction and the synchronous modes. This thesis presents some important advances concerning dynamic modeling, simulation and analysis of the BDFM. Initially, a two-axis model and its associated parameters are developed and calculated. The...
Resource Type:: Dissertation

Effect of structural parameters on resonant tunneling diode performance

Creator:: Yoo, Hyungmo
Resource Type:: Dissertation

Efficient decision feedback receiver design for cellular CDMA spread spectrum communications

Creator:: Volz, Patrick U.
Abstract:: This dissertation presents the continued study of a non-iterative decision feedback (DF) receiver/decoder design and its application to cellular communications or wireless local loop systems based on the IS-95(-A) standard of the Telecommunications Industry Association and also Personal Communications Services systems based on the American National Standards Institute standard J-STD-...
Resource Type:: Dissertation

Electrical characterization and circuit modeling of interconnections and packages for high speed circuits by time domain measurements

Creator:: Jong, Jyh-ming
Abstract:: With edge rates of high speed digital devices pushing into the sub-nano second range, interconnections with the associated packages play a major role in determining the speed, size and performance of digital circuits and systems. The purpose of this study is to develop experimental techniques based on time domain peeling...
Resource Type:: Dissertation

Electrical characterization of n-type aluminum gallium arsenide

Creator:: Kim, Seung-bae
Resource Type:: Dissertation

Electron transport in coupled double quantum wells and wires

Creator:: Harff, Nathan E.
Resource Type:: Dissertation

Embedded passives in a multilayer medium

Creator:: Seo, Yongseok, 1958-
Abstract:: Recent advances in high density low cost RF and microwave three dimensional integration technologies using LTCC(Low Temperature Cofired Ceramics), laminate and other multilayer hybrid and integrated circuits have increased interest in the design of embedded passive components such as inductors, capacitors and filters. The purpose of this study is to...
Resource Type:: Dissertation

Fabrication and characterization of ACTFEL devices

Creator:: Keir, Paul D.
Abstract:: The goal of this thesis is the identification and synthesis of high-luminance, primary color alternating-current thin-film electroluminescent (ACTFEL) devices. Special attention is paid to the synthesis of primary color green ACTFEL devices because of the lack of an adequate primary green ACTFEL phosphor and the dominance of green wavelengths in...
Resource Type:: Dissertation

Fast bit-level, word-level and parallel arithmetic in finite fields for elliptic curve cryptosystems

Creator:: Halbutoğulları, Alper
Abstract:: Computer and network security has recently become a popular subject due to the explosive growth of the Internet and the migration of commerce practices to the electronic medium. Thus the authenticity and privacy of the information transmitted and the data stored on networked computers is of utmost importance. The deployment...
Resource Type:: Dissertation

Fast Galois field arithmetic for elliptic curve cryptography and error control codes

Creator:: Sunar, Berk
Abstract:: Today's computer and network communication systems rely on authenticated and secure transmission of information, which requires computationally efficient and low bandwidth cryptographic algorithms. Among these cryptographic algorithms are the elliptic curve cryptosystems which use the arithmetic of finite fields. Furthermore, the fields of characteristic two are preferred since they provide...
Resource Type:: Dissertation

Frequency-domain, parameter estimation for a brushless, doubly-fed machine

Creator:: Ramchandran, Ashok
Abstract:: A Brushless, Doubly Fed Machine (BDFM) attempts to combine the advantages of conventional induction and synchronous types of electrical machines by its unique architecture. The validation of BDFM designs in an actual test environment requires the estimation of the BDFM model parameters from actual experimentation. Accurate values for the parameters...
Resource Type:: Dissertation

Generalized modal analysis of electromagnetic- and quantum-waveguide structures and discontinuities

Creator:: Weisshaar, Andreas
Abstract:: Generalized modal analysis techniques for the characterization and modeling of dissipationless planar waveguide structures and discontinuities encountered in microwave and optical integrated circuits, as well as of quantum waveguide structures and devices, are presented. The frequency-dependent transmission properties of the curved microstrip bend are derived by utilizing a second-order perturbation...
Resource Type:: Dissertation

Growth and characterization of III-V compound semiconductor materials for use in novel MODFET structures and related devices

Creator:: Schulte, Donald W.
Resource Type:: Dissertation

High resolution electroluminescent display using active matrix approach

Creator:: Khormaei, Iranpour
Resource Type:: Dissertation

High-accuracy circuits for on-chip capacitor ratio testing and sensor readout

Creator:: Wang, Bo, 1970-
Abstract:: The precise measurement of a capacitance difference or ratio in a digital form is very important for capacitive sensors, for CMOS process characterization as well as for the realization of precise switched-capacitor data converters, amplifiers and other circuits utilizing ratioed capacitors. This thesis introduces design techniques for on-chip capacitor ratio...
Resource Type:: Dissertation

High-linearity switched-capacitor circuits in digital CMOS technologies

Creator:: Yoshizawa, Hirokazu
Abstract:: In this thesis, novel design techniques have been proposed for implementing high-linearity SC circuits in a standard digital CMOS process. They use nonlinear MOSFET capacitors instead of linear double-poly capacitors. To reduce their nonlinearities, a bias voltage is applied to keep MOSFET capacitors in their accumulation regions. For further reduction...
Resource Type:: Dissertation

High-speed algorithms & architectures for number-theoretic cryptosystems

Creator:: Acar, Tolga
Abstract:: Computer and network security systems rely on the privacy and authenticity of information, which requires implementation of cryptographic functions. Software implementations of these functions are often desired because of their flexibility and cost effectiveness. In this study, we concentrate on developing high-speed and area-efficient modular multiplication and exponentiation algorithms for...
Resource Type:: Dissertation

Hot electron transport and relaxation in quantum wells and superlattices

Creator:: Lary, Jenifer Edith
Abstract:: Electron transport and relaxation may be substantially different in low-dimensional systems compared to that observed in bulk material. In the present work, Monte Carlo models are used for the solution to the Boltzmann transport equation, with scattering rates calculated quantum mechanically for superlattice and quantum wells. Carrier relaxation following optical...
Resource Type:: Dissertation

Improved design techniques for low-voltage low-power switched-capacitor delta-sigma modulators

Creator:: Grilo, Jorge
Abstract:: This dissertation investigates the constraints which arise when switched-capacitor (SC) delta-sigma modulators are designed for low-voltage operation, targeting also low power dissipation, and proposes methods of improving the performance and optimizing for low power dissipation. This is accomplished by identifying critical elements whose performance can lead to increased power dissipation,...
Resource Type:: Dissertation

Interference cancellation for shot-code DS-CDMA in the presence of channel fading

Creator:: Dutta, Amit K.
Abstract:: Interference from other adjacent users in wireless applications is a major problem in direct-sequence code-division multiple-access (DS-CDMA). This is also known as the near-far problem where a strong signal from one user interferes with other users. The current approach to deal with the near-far problem in DS-CDMA systems is to...
Resource Type:: Dissertation

Investigation and mitigation of the adverse effects of PWM adjustable speed drives

Creator:: Zhang, Haoran
Abstract:: With the introduction of high speed semiconductor power devices and the increased application of adjustable speed drives (ASDs) for efficient speed control of ac motors, there has been a growing number of costly motor-drive related process failures. It has been found that the high dv/dt and high switching frequency have...
Resource Type:: Dissertation

Joint convolutional and orthogonal decoding of interleaved-data frames for IS-95 CDMA communications

Creator:: Rabinowitz, David
Abstract:: IS-95, an interim standard proposed for future digital personal communications systems, uses two levels of encoding of digital data for error control and compatibility with code-division multiple access (CDMA) transmission. The data is first convolutionally encoded and the resulting symbols are interleaved and then groups are encoded as orthogonal Walsh...
Resource Type:: Dissertation

Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping

Creator:: Shui, Tao, 1969-
Abstract:: Delta-sigma modulators are currently a very popular technique for making high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). These oversampled data converters have several advantages over conventional Nyquist-rate converters, including an insensitivity to many analog component imperfections, a simpler antialiasing filter and reduced accuracy requirements in the sample and hold....
Resource Type:: Dissertation

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